Glass-shearing device.



W. J. MILLER. GLASS SHEARING DEVICE. APPLICATION FILED 001217, 1910.

992,230; Patented May16,1911.

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83 k gwugmto mlimlmll I. I MK 4 W. J. MILLER.

GLASS SHEARING DEVICE. APPLICATION FILED 001 .17, 1910.

Patented May 16, 1911.

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Svwemfo'c Zer ' UNITED STATES PATENT OFFICE.

WILLIAM J. MILLEIQOF COLUMBUS, OHIO.

GLASS-SHEARING DEVICE.

Specification of Letters latent. Patented May 16, 1911.

Application filed October 17, 1910. Serial No. 587,392.

To all whom "it may concern."

Be it known that I, \VILLIAM J. MILLER, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented a certain new and useful Improvement in Glass-Shearing Devices, of which the following is a specification.

The object of this invention is generally to provide simplified and effective means for use in connection with glass molding machines for severing the string of a lump of hot glass when the lump has been deposited by the punty into the mold, but it is more especially the object of this invention to make available in such means blades that have straight shearing edges because such edges are more easily ground.

'The invention is embodied in the construction herein shown, described, and claimed, the invention not being confined to the particular instance of it illustrated in .the accompanying drawings.

In said drawingsFigure 1 is a plan view of the invention. Fig. 2 is a vertical sectionon the line Fig. 1. Fig. 3 is an elevation looking toward the left hand end of Fig. 1. Fig. l is a cross section on the line Fig. 1.

The frame upon which the shearing blades are supported or are operated comprises a portion including a cylinder 15 and an angular portion 16 consisting of a horizontal table and a vertical portion secured to the cylinder and forming the outer head of the latter. Within the cylinder is a piston 17 having its rod 18 extended through a suitable stufling box on the aforesaid outer head. On the outer end of the piston rod is se cured a cross head 19. The characters 20 and 21 designate blade carriers. These blade carriers are levers fulcrumedon pins 22. 22. on the table near the outer end of the cylinder and below the plane of the cross head. Secured in the cross head by means of set screws 23, 23, are the shanks of pins, the lower ends of each of which is reduced to form a short cylindrical stud as seen at 24 and 24, the axis of which is eccentric to the axis of the shank bearing it. On each of these studs is an antifriction roller as, seen at 25. The studs with their antifriction rollers project into slots as seen at 26 and 27 inclined to each other, and to the inner edge of the blade carrier as shown, so that upon reciprocation of the cross head the blade carriers aremoved toward and from each other. The blade carriers are each provided with a seat for a blade.

28 and 29 designate the blades in the seats of carriers 20 and 21 respectively. The blades are made of a flat rectangular piece of steel with their shearing edges ground straight. The blades are held on their seats by clips 33, 33 secured by screws.

30 designates the usual circular downwardly tapering or funnel-shaped opening in the table through which the hot glass is dropped into the mold. The seat for the blade 28' is flat but inclined downward and outward with reference to the blade carrier longitudinally, and laterally with reference to that carrier toward the dropping opening 30. The seat for the blade 29 is inclined upward and outward longitudinally with reference to the blade carrier and laterally downward away from the opening 30. But

the seats are so positioned that the blade 28 works over the blade 29 and by reason of their described inclinations contact atone point only as their shearing edges cross each other upon being moved toward each other.

In my drawing, Fig. 2. I have somewhat exaggerated the inclination of the blade as seen at 28 for the purpose of indicating on the drawing the fact that the blade is inclined. In practice the inclination of the blade can vary somewhat but a suitable inclination is one half a degree or less. The blades are mounted so that when moved toward each other their shearing edges intersect at angles to each other in plan View all the way across the opening 30. There is thus obtained somewhat the shearing action observed in a pair of ordinary scissors. The scissors-like action is obtained by reason of the fact that there is a slight vertical play of the upper blade due to ordinary or inevitable looseness of fit of the blade carrier under the cross head. The blades are also so positioned with reference to each other that when the shearing edges are moved to ward each other the full outward stroke of the cross head the point of contact of the blades may move through the plane of a diameter of the opening 30;

The character 31 designates a springfinger extending laterally beyond the outer end the effect described can be had by mounting the blade 28 to lie in the inclined position described and the blade 29 to lie in a hori zontal plane. That is to say the contact between the shearing edges of the blades will still be at a single point which moves through the plane of a diameter of the opening 30.

Where this shearing device is to be used in connection with a glass molding machine like that illustrated in the United States patent to Edward Miller, No. 787,050, dated April 11, 1905, it is secured to the column or post 1 of such machine and in substantially the manner shown in my United States Patent No. 937 ,626 dated October 19, 1909.

The piston herein can be reciprocated by fluid pressure to operate the cross head and the blades and upon the out-wardv stroke to move the latter toward each other to perform the shearing operation and upon the inward stroke from each other to separate them for a repetition of that operation as will be well understood.

It,is'advantageous and it is preferred that the system of valves contemplated in my aforesaid patent be used, especially where the invention is applied'to such machine. Before the fluid pressure is admitted to force the cross head out-ward the gatherer drops a lump of hot glass through the funnel shaped opening 30 and the string of glass between the punty and the lump below is sheared and severad by proper lever to move the piston. To open the shears the pressure is, of course, reversed and admitted to the cylinder to cause the inward stroke of the piston and cross head.

By partially rotating the'shanks of the eccentric studs 24, 24, a nice adjustment of the relative positions of the carriers to each other, to secure, for example, the described diametrical passage of the point of contact depressing the of the blades across the opening 30 can be obtained.

What I claim is:

1. Means for shearing glass including, in combination, a pair of fulcrumed levers constituting blade-supports or carriers, blades on said levers having straight edges, the seats for said blades on said levers being each doubly inclined to cause contact between the blades at one point only when the carriers are swung toward each other and means for swinging said levers, substantially as described.

2. Means for shearing glass including, in combination, a pair of fulcrumed levers constituting blade supports or carriers, blades on said levers having straight edges, the seat for one of said blades being doubly inclined to cause contact between the blades at one point only when the carriers are swung toward each other, and means for swinging said levers, substantially as described.

3. Means for shearing glass including, in combination, a pair of fulcrumed levers constituting blade supports or carriers, blades on said levers having straight edges, the seat for one of said blades being suitably inclined to cause contact between the blades at one point only when the carriers are swung to- 

